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Abstract

After a magnet has been installed within a typewriter or other mechanical apparatus, it is many times virtually impossible to secure access to the magnet in such a way as to be able to measure its hold force through conventional techniques. In view of the inability to physically access the magnet for such a measurement, it has been found that there is an empirical relationship between drop time and the hold force of a magnet. If the magnet is displaying excessive holding force, the drop time of the magnet will be slow due to the fact that it takes a longer period for the magnetic flux to dissipate, thereby releasing the armature.

Country

United States

Language

English (United States)

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Indirect Measurement of Magnet Hold Forces

After a magnet has been installed within a typewriter or other
mechanical apparatus, it is many times virtually impossible to secure
access to the magnet in such a way as to be able to measure its
hold force through conventional techniques. In view of the inability
to physically access the magnet for such a measurement, it has been
found that there is an empirical relationship between drop time and
the hold force of a magnet. If the magnet is displaying excessive
holding force, the drop time of the magnet will be slow due to the
fact that it takes a longer period for the magnetic flux to
dissipate, thereby releasing the armature. If the magnet is holding
at a diminished force level, the magnetic component of the time delay
required to drop the armature is low because the current in the coil
and the magnetic flux field associated with the coil are weak and
therefore dissipate very rapidly. Therefore, it can be determined by
measuring the time that a electromagnet or magnetic device having an
armature takes to drop whether or not the magnet is operating within
the required holding force limits. This technique of measuring the
drop time can be accomplished utilizing detection devices which do
not have to have physical engagement with the magnet but rather may
be attached to leads leading to and from the magnet such that the
current flow in the coil may be detected and the current
characteristics of the coil digitized such t...